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mod_s2s_auth_fingerprint: Describe cert pinning mode
author Kim Alvefur <>
date Fri, 16 Aug 2013 00:23:17 +0200
parents 4a39ef28e2d9
children dc20cb1bb874
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#summary Fingerprint based s2s authentication

= Introduction =

This module allows you to explicitly say that you trust remote servers if they show a certificate with a known fingerprint.
This is useful if you have many connections to servers that use self-signed certificates.

= Details =

In the default mode, the module will only mark connections as trusted *if* their certificate matches one of the fingerprints listed.
If it doesn't match, the status of the standard PKIX and identity validation is preserved.
Thus it is easy to switch from a self-signed certificate to a CA-signed certificate.

The module has an optional mode in which it will reject listed servers that don't match one of the listed fingerprints, aka certificate pinning.
Servers not listed in the configuration are not affected.

= Configuration =

After installing and enabling this module, you can put SHA-1 fingerprints of remote servers in your config like this:

s2s_trusted_fingerprints = {
	[""] = "11:C2:3D:87:3F:95:F8:13:F8:CA:81:33:71:36:A7:00:E0:01:95:ED";
	[""] = {

To enable certificate pinning mode, set {{{s2s_pin_fingerprints = true}}}

= Compatibility =

||0.8||Doesn't work||